Elastic Clamping for Precise Monolith Stuffing
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Summary
Problems
The existing methods for stuffing a monolith wrapped in a mounting mat into a housing often result in overpressing or shearing of the mat, leading to reduced lifespan of catalytic converters and diesel particulate filters, due to tolerance deviations and potential rotation issues during the insertion process.
Innovation solutions
A method involving radial elastic clamping of the housing at multiple locations during stuffing to compensate for housing tolerances and rotation, using a stuffing funnel with a contour slightly smaller than the housing's smallest diameter, ensuring minimal error and preventing damage to the mounting mat.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the mounting mat is compressed more during stuffing to ensure secure holding, then the holding force increases, but the mounting mat is permanently damaged and its spring effect is reduced
Why choose this principle:
The housing is pre-clamped at multiple locations before stuffing the monolith with mounting mat. This preliminary clamping creates elastic deformation that compensates for tolerance deviations and prevents excessive compression of the mounting mat during the stuffing process, thereby protecting the mounting mat's spring effect while ensuring secure holding
Principle concept:
If the housing diameter is reduced to minimize play, then the fit improves, but the mounting mat is overpressed and damaged due to tolerance deviations
Why choose this principle:
The clamping force is dynamically adjusted during the stuffing process. By controlling the clamping force to create only elastic deformation rather than plastic deformation, the housing maintains its dimensional stability while accommodating tolerance deviations without overpressing the mounting mat
Application Domain
Data Source
AI summary:
A method involving radial elastic clamping of the housing at multiple locations during stuffing to compensate for housing tolerances and rotation, using a stuffing funnel with a contour slightly smaller than the housing's smallest diameter, ensuring minimal error and preventing damage to the mounting mat.
Abstract
A method for stuffing a monolith wrapped with a mounting mat into a housing includes the steps of radially elastically clamping the housing during stuffing at several locations, and compensating for at least one of a housing tolerance and a housing rotation through an elastic deformation of the housing caused by the clamping.